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parser: Note intent to switch to a Pratt parser

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This commit is contained in:
John 2024-02-27 23:35:41 -06:00
parent ca51a35f5c
commit 67bb3d4ae3
1 changed files with 16 additions and 15 deletions
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31
libconlang/src/parser.rs
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@ -326,7 +326,7 @@ const PARENS: (Type, Type) = (Type::LParen, Type::RParen);
const fn delim<'t, T>(
f: impl Fn(&mut Parser<'t>) -> PResult<T>,
delim: (Type, Type),
while_parsing: Parsing,
while_parsing: Parsing,
) -> impl Fn(&mut Parser<'t>) -> PResult<T> {
move |parser| {
parser.match_type(delim.0, while_parsing)?;
@ -337,13 +337,13 @@ const fn delim<'t, T>(
}
/// Parses constructions of the form `(f sep ~until)*`
///
///
/// where `~until` is a negative lookahead assertion
const fn sep<'t, T>(
f: impl Fn(&mut Parser<'t>) -> PResult<T>,
sep: Type,
until: Type,
while_parsing: Parsing,
while_parsing: Parsing,
) -> impl Fn(&mut Parser<'t>) -> PResult<Vec<T>> {
move |parser| {
let mut args = vec![];
@ -359,13 +359,13 @@ const fn sep<'t, T>(
}
/// Parses constructions of the form `(f ~until)*`
///
///
/// where `~until` is a negative lookahead assertion
#[allow(dead_code)]
const fn rep<'t, T>(
f: impl Fn(&mut Parser<'t>) -> PResult<T>,
until: Type,
while_parsing: Parsing,
while_parsing: Parsing,
) -> impl Fn(&mut Parser<'t>) -> PResult<Vec<T>> {
move |parser| {
let mut out = vec![];
@ -380,16 +380,16 @@ const fn rep<'t, T>(
macro item_like() {
Type::Hash
| Type::Keyword(
Keyword::Pub
| Keyword::Type
| Keyword::Const
| Keyword::Static
| Keyword::Mod
| Keyword::Fn
| Keyword::Struct
| Keyword::Enum
| Keyword::Impl,
)
Keyword::Pub
| Keyword::Type
| Keyword::Const
| Keyword::Static
| Keyword::Mod
| Keyword::Fn
| Keyword::Struct
| Keyword::Enum
| Keyword::Impl,
)
}
/// Top level parsing
@ -897,6 +897,7 @@ impl<'t> Parser<'t> {
};
Ok(Assign { head, op, tail: self.expr_from(Self::exprkind_assign)?.into() }.into())
}
// TODO: use a pratt parser for binary expressions, to simplify this
binary! {
exprkind_compare {exprkind_range, compare_op}
exprkind_range {exprkind_logic, range_op}